<template>
	<el-container class="chat-box">
		<el-header height="60px">
			<span>{{title}}</span>
			<span title="群聊信息" v-show="this.chat.type=='GROUP'" class="btn-side el-icon-more"
				@click="showSide=!showSide"></span>
		</el-header>
		<el-main style="padding: 0;">
			<el-container>
				<el-container class="content-box">
					<el-main class="im-chat-main" id="chatScrollBox" @scroll="handleScroll">
						<div class="im-chat-box">
							<ul>
								<li v-for="(msgInfo,idx) in chat.messages" :key="idx">
									<chat-message-item v-show="idx>=showMinIdx" :mine="msgInfo.sendId == mine.id" :headImage="headImage(msgInfo)"
										:showName="showName(msgInfo)" :msgInfo="msgInfo" @delete="deleteMessage"
										@recall="recallMessage">
									</chat-message-item>
								</li>
							</ul>
						</div>
					</el-main>
					<el-footer height="240px" class="im-chat-footer">
						<div class="chat-tool-bar">
							<div title="表情" class="icon iconfont icon-biaoqing" ref="emotion"
								@click="switchEmotionBox()">
							</div>
							<div title="发送图片">
								<file-upload :action="imageAction" :maxSize="5*1024*1024"
									:fileTypes="['image/jpeg', 'image/png', 'image/jpg', 'image/webp','image/gif']"
									@before="handleImageBefore" @success="handleImageSuccess" @fail="handleImageFail">
									<i class="el-icon-picture-outline"></i>
								</file-upload>
							</div>
							<div title="发送文件">
								<file-upload :action="fileAction" :maxSize="10*1024*1024" @before="handleFileBefore"
									@success="handleFileSuccess" @fail="handleFileFail">
									<i class="el-icon-wallet"></i>
								</file-upload>
							</div>
							<div title="发送语音" class="el-icon-microphone" @click="showVoiceBox()">
							</div>
							<div title="视频聊天" v-show="chat.type=='PRIVATE'" class="el-icon-phone-outline"
								@click="showVideoBox()">
							</div>
							<div title="聊天记录" class="el-icon-chat-dot-round" @click="showHistoryBox()"></div>
						</div>
						<div class="send-content-area">
							<textarea v-show="!sendImageUrl" v-model="sendText" ref="sendBox" class="send-text-area"
								:disabled="lockMessage" @keydown.enter="sendTextMessage()" @paste="handlePaste"
								placeholder="温馨提示:可以粘贴截图到这里了哦~"></textarea>

							<div v-show="sendImageUrl" class="send-image-area">
								<div class="send-image-box">
									<img class="send-image" :src="sendImageUrl" />
									<span class="send-image-close el-icon-close" title="删除"
										@click="removeSendImage()"></span>
								</div>
							</div>
							<div class="send-btn-area">
								<el-button type="primary" size="small" @click="handleSendMessage()">发送</el-button>
							</div>
						</div>
					</el-footer>
				</el-container>
				<el-aside class="chat-group-side-box" width="300px" v-show="showSide">
					<chat-group-side :group="group" :groupMembers="groupMembers" @reload="loadGroup(group.id)">
					</chat-group-side>
				</el-aside>
			</el-container>
		</el-main>
		<emotion v-show="showEmotion" :pos="emoBoxPos" @emotion="handleEmotion"></Emotion>
		<chat-voice :visible="showVoice" @close="closeVoiceBox" @send="handleSendVoice"></chat-voice>
		<chat-history :visible="showHistory" :chat="chat" :friend="friend" :group="group" :groupMembers="groupMembers"
			@close="closeHistoryBox"></chat-history>
	</el-container>
</template>

<script>
	import ChatGroupSide from "./ChatGroupSide.vue";
	import ChatMessageItem from "./ChatMessageItem.vue";
	import FileUpload from "../common/FileUpload.vue";
	import Emotion from "../common/Emotion.vue";
	import ChatVoice from "./ChatVoice.vue";
	import ChatHistory from "./ChatHistory.vue";

	export default {
		name: "chatPrivate",
		components: {
			ChatMessageItem,
			FileUpload,
			ChatGroupSide,
			Emotion,
			ChatVoice,
			ChatHistory
		},
		props: {
			chat: {
				type: Object
			}
		},
		data() {
			return {
				friend: {},
				group: {},
				groupMembers: [],
				sendText: "",
				sendImageUrl: "",
				sendImageFile: "",
				showVoice: false, // 是否显示语音录制弹窗
				showSide: false, // 是否显示群聊信息栏
				showEmotion: false, // 是否显示emoji表情
				emoBoxPos: { // emoji表情弹出位置
					x: 0,
					y: 0
				},
				showHistory: false, // 是否显示历史聊天记录
				lockMessage: false, // 是否锁定发送，
				showMinIdx: 0 // 下标低于showMinIdx的消息不显示，否则页面会很卡
			}
		},
		methods: {
			handlePaste(e) {
				let txt = event.clipboardData.getData('Text')
				if (typeof(txt) == 'string') {
					this.sendText += txt
				}
				const items = (event.clipboardData || window.clipboardData).items
				if (items.length) {
					for (let i = 0; i < items.length; i++) {
						if (items[i].type.indexOf('image') !== -1) {
							let file = items[i].getAsFile();
							this.sendImageFile = file;
							this.sendImageUrl = URL.createObjectURL(file);
						}
					}
				}
			},
			removeSendImage() {
				this.sendImageUrl = "";
				this.sendImageFile = null;
			},
			handleImageSuccess(data, file) {
				let msgInfo = JSON.parse(JSON.stringify(file.msgInfo || file.raw.msgInfo));
				msgInfo.content = JSON.stringify(data);
				this.$http({
					url: this.messageAction,
					method: 'post',
					data: msgInfo
				}).then((id) => {
					msgInfo.loadStatus = 'ok';
					msgInfo.id = id;
					this.$store.commit("insertMessage", msgInfo);
				})
			},
			handleImageFail(e, file) {
				let msgInfo = JSON.parse(JSON.stringify(file.msgInfo || file.raw.msgInfo));
				msgInfo.loadStatus = 'fail';
				this.$store.commit("insertMessage", msgInfo);
			},
			handleImageBefore(file) {
				let url = URL.createObjectURL(file);
				let data = {
					originUrl: url,
					thumbUrl: url
				}
				let msgInfo = {
					id: 0,
					fileId: file.uid,
					sendId: this.mine.id,
					content: JSON.stringify(data),
					sendTime: new Date().getTime(),
					selfSend: true,
					type: 1,
					loadStatus: "loading",
					status: this.$enums.MESSAGE_STATUS.UNSEND
				}
				// 填充对方id
				this.fillTargetId(msgInfo, this.chat.targetId);
				// 插入消息
				this.$store.commit("insertMessage", msgInfo);
				// 滚动到底部
				this.scrollToBottom();
				// 借助file对象保存
				file.msgInfo = msgInfo;
			},
			handleFileSuccess(url, file) {
				let data = {
					name: file.name,
					size: file.size,
					url: url
				}
				let msgInfo = JSON.parse(JSON.stringify(file.raw.msgInfo));
				msgInfo.content = JSON.stringify(data);
				this.$http({
					url: this.messageAction,
					method: 'post',
					data: msgInfo
				}).then((id) => {
					msgInfo.loadStatus = 'ok';
					msgInfo.id = id;
					this.$store.commit("insertMessage", msgInfo);
				})
			},
			handleFileFail(e, file) {

				let msgInfo = JSON.parse(JSON.stringify(file.raw.msgInfo));
				msgInfo.loadStatus = 'fail';
				this.$store.commit("insertMessage", msgInfo);
			},
			handleFileBefore(file) {
				let url = URL.createObjectURL(file);
				let data = {
					name: file.name,
					size: file.size,
					url: url
				}
				let msgInfo = {
					id: 0,
					sendId: this.mine.id,
					content: JSON.stringify(data),
					sendTime: new Date().getTime(),
					selfSend: true,
					type: 2,
					loadStatus: "loading",
					status: this.$enums.MESSAGE_STATUS.UNSEND
				}
				// 填充对方id
				this.fillTargetId(msgInfo, this.chat.targetId);
				// 插入消息
				this.$store.commit("insertMessage", msgInfo);
				// 滚动到底部
				this.scrollToBottom();
				// 借助file对象透传
				file.msgInfo = msgInfo;
			},
			handleCloseSide() {
				this.showSide = false;
			},
			handleScrollToTop() {
				// 多展示10条信息
				this.showMinIdx = this.showMinIdx > 10 ? this.showMinIdx - 10 : 0;
			},
			handleScroll(e) {
				let scrollElement = e.target
				let scrollTop = scrollElement.scrollTop
				if (scrollTop < 30 ) { // 在顶部,不滚动的情况
					// 多展示20条信息
					this.showMinIdx = this.showMinIdx > 20 ? this.showMinIdx - 20 : 0;
				}
			},
			switchEmotionBox() {
				this.showEmotion = !this.showEmotion;
				let width = this.$refs.emotion.offsetWidth;
				let left = this.$elm.fixLeft(this.$refs.emotion);
				let top = this.$elm.fixTop(this.$refs.emotion);
				this.emoBoxPos.y = top;
				this.emoBoxPos.x = left + width / 2;
			},
			handleEmotion(emoText) {
				this.sendText += emoText;
				this.showEmotion = false;
				// 保持输入框焦点
				this.$refs.sendBox.focus();
			},
			showVoiceBox() {
				this.showVoice = true;
			},
			closeVoiceBox() {
				this.showVoice = false;
			},
			showVideoBox() {
				this.$store.commit("showChatPrivateVideoBox", {
					friend: this.friend,
					master: true
				});
			},
			showHistoryBox() {
				this.showHistory = true;
			},
			closeHistoryBox() {
				this.showHistory = false;
			},
			handleSendVoice(data) {
				let msgInfo = {
					content: JSON.stringify(data),
					type: 3
				}
				// 填充对方id
				this.fillTargetId(msgInfo, this.chat.targetId);
				this.$http({
					url: this.messageAction,
					method: 'post',
					data: msgInfo
				}).then((id) => {
					msgInfo.id = id;
					msgInfo.sendTime = new Date().getTime();
					msgInfo.sendId = this.$store.state.userStore.userInfo.id;
					msgInfo.selfSend = true;
					msgInfo.status = this.$enums.MESSAGE_STATUS.UNSEND;
					this.$store.commit("insertMessage", msgInfo);
					// 保持输入框焦点
					this.$refs.sendBox.focus();
					// 滚动到底部
					this.scrollToBottom();
					// 关闭录音窗口
					this.showVoice = false;
				})
			},
			fillTargetId(msgInfo, targetId) {
				if (this.chat.type == "GROUP") {
					msgInfo.groupId = targetId;
				} else {
					msgInfo.recvId = targetId;
				}
			},
			handleSendMessage() {
				if (this.sendImageFile) {
					this.sendImageMessage();
				} else {
					this.sendTextMessage();
				}
			},
			sendImageMessage() {
				let file = this.sendImageFile;
				this.handleImageBefore(this.sendImageFile);
				let formData = new FormData()
				formData.append('file', file.raw || file)
				this.$http.post("/image/upload", formData, {
					headers: {
						'Content-Type': 'multipart/form-data'
					}
				}).then((data) => {
					this.handleImageSuccess(data, file);
				}).catch((res) => {
					this.handleImageSuccess(res, file);
				})
				this.sendImageFile = null;
				this.sendImageUrl = "";
				this.$nextTick(() => this.$refs.sendBox.focus());
				this.scrollToBottom();
			},
			sendTextMessage() {
				if (!this.sendText.trim()) {
					return
				}
				let msgInfo = {
					content: this.sendText,
					type: 0
				}
				// 填充对方id
				this.fillTargetId(msgInfo, this.chat.targetId);
				this.lockMessage = true;
				this.$http({
					url: this.messageAction,
					method: 'post',
					data: msgInfo
				}).then((id) => {
					this.sendText = "";
					msgInfo.id = id;
					msgInfo.sendTime = new Date().getTime();
					msgInfo.sendId = this.$store.state.userStore.userInfo.id;
					msgInfo.selfSend = true;
					msgInfo.status = this.$enums.MESSAGE_STATUS.UNSEND;
					this.$store.commit("insertMessage", msgInfo);
				}).finally(() => {
					// 解除锁定
					this.lockMessage = false;
					// 保持输入框焦点
					this.$nextTick(() => this.$refs.sendBox.focus());
					// 滚动到底部
					this.scrollToBottom();
				});
				const e = window.event || arguments[0];
				if (e.key === 'Enter' || e.code === 'Enter' || e.keyCode === 13) {
					e.returnValue = false;
					e.preventDefault();
					return false;
				}
			},
			deleteMessage(msgInfo) {
				this.$confirm('确认删除消息?', '删除消息', {
					confirmButtonText: '确定',
					cancelButtonText: '取消',
					type: 'warning'
				}).then(() => {
					this.$store.commit("deleteMessage", msgInfo);
				});
			},
			recallMessage(msgInfo) {
				this.$confirm('确认撤回消息?', '撤回消息', {
					confirmButtonText: '确定',
					cancelButtonText: '取消',
					type: 'warning'
				}).then(() => {
					let url = `/message/${this.chat.type.toLowerCase()}/recall/${msgInfo.id}`
					this.$http({
						url: url,
						method: 'delete'
					}).then(() => {
						this.$message.success("消息已撤回");
						msgInfo = JSON.parse(JSON.stringify(msgInfo));
						msgInfo.type = 10;
						msgInfo.content = '你撤回了一条消息';
						msgInfo.status = this.$enums.MESSAGE_STATUS.RECALL;
						this.$store.commit("insertMessage", msgInfo);
					})
				});
			},
			readedMessage() {
				if (this.chat.type == "GROUP") {
					var url = `/message/group/readed?groupId=${this.chat.targetId}`
				} else {
					url = `/message/private/readed?friendId=${this.chat.targetId}`
				}
				this.$http({
					url: url,
					method: 'put'
				}).then(() => {
					this.$store.commit("resetUnreadCount", this.chat)
					this.scrollToBottom();
				})
			},
			loadGroup(groupId) {
				this.$http({
					url: `/group/find/${groupId}`,
					method: 'get'
				}).then((group) => {
					this.group = group;
					this.$store.commit("updateChatFromGroup", group);
					this.$store.commit("updateGroup", group);

				});

				this.$http({
					url: `/group/members/${groupId}`,
					method: 'get'
				}).then((groupMembers) => {
					this.groupMembers = groupMembers;
				});
			},
			loadFriend(friendId) {
				// 获取对方最新信息
				this.$http({
					url: `/user/find/${friendId}`,
					method: 'get'
				}).then((friend) => {
					this.friend = friend;
					this.$store.commit("updateChatFromFriend", friend);
					this.$store.commit("updateFriend", friend);
				})
			},
			showName(msgInfo) {
				if (this.chat.type == 'GROUP') {
					let member = this.groupMembers.find((m) => m.userId == msgInfo.sendId);
					return member ? member.aliasName : "";
				} else {
					return msgInfo.sendId == this.mine.id ? this.mine.nickName : this.chat.showName
				}

			},
			headImage(msgInfo) {
				if (this.chat.type == 'GROUP') {
					let member = this.groupMembers.find((m) => m.userId == msgInfo.sendId);
					return member ? member.headImage : "";
				} else {
					return msgInfo.sendId == this.mine.id ? this.mine.headImageThumb : this.chat.headImage
				}
			},
			scrollToBottom() {
				this.$nextTick(() => {
					let div = document.getElementById("chatScrollBox");
					div.scrollTop = div.scrollHeight;
				});
			}
		},
		computed: {
			mine() {
				return this.$store.state.userStore.userInfo;
			},
			title() {
				let title = this.chat.showName;
				if (this.chat.type == "GROUP") {
					let size = this.groupMembers.filter(m => !m.quit).length;
					title += `(${size})`;
				}
				return title;
			},
			imageAction() {
				return `${process.env.VUE_APP_BASE_API}/image/upload`;
			},
			fileAction() {
				return `${process.env.VUE_APP_BASE_API}/file/upload`;
			},
			messageAction() {
				return `/message/${this.chat.type.toLowerCase()}/send`;
			},
			unreadCount() {
				return this.chat.unreadCount;
			}
		},
		watch: {
			chat: {
				handler(newChat, oldChat) {
					if (newChat.targetId > 0 && (!oldChat || newChat.type != oldChat.type ||
							newChat.targetId != oldChat.targetId)) {
						if (this.chat.type == "GROUP") {
							this.loadGroup(this.chat.targetId);
						} else {
							this.loadFriend(this.chat.targetId);
						}
						// 滚到底部
						this.scrollToBottom();
						this.sendText = "";
						// 消息已读
						this.readedMessage()
						// 初始状态只显示30条消息
						let size = this.chat.messages.length;
						this.showMinIdx = size > 30 ? size - 30 : 0;
						// 保持输入框焦点
						this.$nextTick(() => {
							this.$refs.sendBox.focus();
						})
					}
				},
				immediate: true
			},
			unreadCount: {
				handler(newCount, oldCount) {
					if (newCount > 0) {
						// 消息已读
						this.readedMessage()
					}
				}
			}
		},
		mounted() {
			let div = document.getElementById("chatScrollBox");
			div.addEventListener('scroll', this.handleScroll)
		}
	}
</script>

<style lang="scss">
	.chat-box {
		background: white;
		border: #dddddd solid 1px;

		.el-header {
			padding: 5px;
			background-color: white;
			line-height: 50px;
			font-size: 20px;
			font-weight: 600;
			border: #dddddd solid 1px;

			.btn-side {
				position: absolute;
				right: 20px;
				line-height: 60px;
				font-size: 22px;
				cursor: pointer;

				&:hover {
					font-size: 30px;
				}
			}
		}

		.im-chat-main {
			padding: 0;
			border: #dddddd solid 1px;

			.im-chat-box {
				>ul {
					padding: 20px;

					li {
						list-style-type: none;
					}
				}
			}
		}

		.im-chat-footer {
			display: flex;
			flex-direction: column;
			padding: 0;
			border: #dddddd solid 1px;

			.chat-tool-bar {

				display: flex;
				position: relative;
				width: 100%;
				height: 40px;
				text-align: left;
				box-sizing: border-box;
				border: #dddddd solid 1px;

				>div {
					margin-left: 10px;
					font-size: 22px;
					cursor: pointer;
					color: #333333;
					line-height: 40px;

					&:hover {
						color: black;
					}
				}
			}

			.send-content-area {
				display: flex;
				flex-direction: column;
				height: 100%;
				background-color: #f8f8f8 !important;
				outline-color: rgba(83, 160, 231, 0.61);

				.send-text-area {
					box-sizing: border-box;
					padding: 5px;
					width: 100%;
					flex: 1;
					resize: none;
					font-size: 16px;
					color: black;
					background-color: #f8f8f8 !important;
					outline-color: rgba(83, 160, 231, 0.61);

				}

				.send-image-area {
					text-align: left;

					.send-image-box {
						position: relative;
						display: inline-block;

						.send-image {
							max-height: 190px;
							border: 1px solid #ccc;
							border-radius: 2%;
							margin: 2px;
						}

						.send-image-close {
							position: absolute;
							padding: 3px;
							right: 7px;
							top: 7px;
							color: white;
							cursor: pointer;
							font-size: 15px;
							font-weight: 600;
							background-color: #aaa;
							border-radius: 50%;
							border: 1px solid #ccc;
						}
					}

				}

				.send-btn-area {
					padding: 10px;
					position: absolute;
					bottom: 0;
					right: 0;
				}
			}

		}

		.chat-group-side-box {
			border: #dddddd solid 1px;
			animation: rtl-drawer-in .3s 1ms;
		}
	}
</style>